In a fractional exponent, the top number is the power, and the lower number is the root.
Example: 82/3
In the fractional exponent 2/3, 2 is the power and 1/3 is the cube root
we can either find the cube root of 8 first or square 8 first
(81/3)2 = 22 = 4
(82)1/3 = 3Ö64 = 4